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Rifles, Reloading, Optics, Equipment
Reloading
Load work up...seating depth test first OR charge weight first?
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<blockquote data-quote="J E Custom" data-source="post: 1405944" data-attributes="member: 2736"><p>I first approach the powder selection based on what a maximum charge</p><p>would be at 98% to 100% Case capacity and yield the highest or close to the highest velocity with pressures within SAMME pressure ratings using the preferred bullet weight. Normally there are 3 0r 4 choices.</p><p></p><p>Then with the bullet seated at Magazine length minus .010 thousandths I start with 2 grains less that the maximum listed (This gives me plenty of room to move up or down with these powder charges during testing, plus I can change the seating depth later To tweak the accuracy.</p><p></p><p>Next, based on the powder type and burn rate I decide what I think the best primer Brisance (Heat) is for the most complete burn would be and ease to start the ignition. (This does not always mean the hottest primer will be the best because some powders ignite easier than others).</p><p></p><p>With 5 loads of each of these powders in hand, I shoot them through a chronograph Looking for the best SDs (This tells me if I have a good powder/ primer combination). If I shoot two rounds and the SDs are poor (I prefer single digits, but can live with SDs below 15 to start with)</p><p>I cease shooting that load and move on to the next (No reason to just burn them up when I can pull the bullet and reload with a better combination later). </p><p></p><p>Then once I have found an SD to my liking (Normally 03 to 07) I move own with moving the powder charge up by .3 grain increments, Chronographing as I go for SDs and velocity looking for best SDs and accuracy without pressure signs. This has to be done carefully, because some powders will go critical (Go from a normal pressure to well Over Maximum with one slight increase.</p><p></p><p>Once my records show I am where I want to be with the bullet weight, powder and charge plus the primer and with the best SDs and velocity, I look at the best bullet for accuracy and its seating depth (First I find the most accurate bullet and then I test to find the optimum seating depth.</p><p></p><p>It sounds like a long drawn out procedure, But it works for me and normally I can find a great load with less than 25 or 30 test firings. The old way (Hit and miss) could take 50 to 100 rounds depending on how lucky I was.</p><p></p><p>NOTE: Only make one change at a time or you will be chasing your tail.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1405944, member: 2736"] I first approach the powder selection based on what a maximum charge would be at 98% to 100% Case capacity and yield the highest or close to the highest velocity with pressures within SAMME pressure ratings using the preferred bullet weight. Normally there are 3 0r 4 choices. Then with the bullet seated at Magazine length minus .010 thousandths I start with 2 grains less that the maximum listed (This gives me plenty of room to move up or down with these powder charges during testing, plus I can change the seating depth later To tweak the accuracy. Next, based on the powder type and burn rate I decide what I think the best primer Brisance (Heat) is for the most complete burn would be and ease to start the ignition. (This does not always mean the hottest primer will be the best because some powders ignite easier than others). With 5 loads of each of these powders in hand, I shoot them through a chronograph Looking for the best SDs (This tells me if I have a good powder/ primer combination). If I shoot two rounds and the SDs are poor (I prefer single digits, but can live with SDs below 15 to start with) I cease shooting that load and move on to the next (No reason to just burn them up when I can pull the bullet and reload with a better combination later). Then once I have found an SD to my liking (Normally 03 to 07) I move own with moving the powder charge up by .3 grain increments, Chronographing as I go for SDs and velocity looking for best SDs and accuracy without pressure signs. This has to be done carefully, because some powders will go critical (Go from a normal pressure to well Over Maximum with one slight increase. Once my records show I am where I want to be with the bullet weight, powder and charge plus the primer and with the best SDs and velocity, I look at the best bullet for accuracy and its seating depth (First I find the most accurate bullet and then I test to find the optimum seating depth. It sounds like a long drawn out procedure, But it works for me and normally I can find a great load with less than 25 or 30 test firings. The old way (Hit and miss) could take 50 to 100 rounds depending on how lucky I was. NOTE: Only make one change at a time or you will be chasing your tail. J E CUSTOM [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Load work up...seating depth test first OR charge weight first?
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